RubyMotion by Clay Allsopp PDF

Tablets E Readers

By Clay Allsopp

Make attractive apps with attractive code: use the based and concise Ruby programming language with RubyMotion to write down really local iOS apps with much less code whereas having extra enjoyable. you will study the necessities of constructing nice apps, and by way of the top of this publication, you should have outfitted a completely practical API-driven app. no matter if you are a newcomer trying to find an alternative choice to Objective-C or a hardened Rails veteran, RubyMotion enables you to create lovely apps without compromise in functionality or developer happiness.

Developers attracted to local iOS app improvement were constrained to the boundaries of Objective-C and Xcode--until RubyMotion got here alongside. RubyMotion allows you do complete iOS improvement utilizing Ruby. you've got entry to everyday instruments reminiscent of Rake and RubyGems and will collect Ruby code into local purposes. RubyMotion even comes with a Ruby console worthy for reside coding and interactive debugging. and because RubyMotion is outfitted on best of the Objective-C runtime, you should use all of Apple's libraries and so much third-party code along Ruby classes.

This booklet takes you from 0 wisdom of iOS improvement to development an app that monitors information regarding shades utilizing an internet carrier API. you are going to paintings via every one subject with a small instance app that covers simply enough to get you acquainted with the recommendations you want to get actual paintings done.

You'll commence with simply drawing containers at the reveal, yet you are going to quick upload animations, a navigation stack, and high-performance desk perspectives. you are going to peek into much less noticeable parts, similar to utilizing Ruby metaprogramming to create JSON-based versions. you will use a few particularly worthy universal Ruby concepts which are purely attainable in RubyMotion, similar to writing automatic unit exams with an RSpec-like framework.

Using either Apple's current libraries and clean, community-driven RubyMotion tasks, you will be good in your option to writing real-world apps.

What You Need:

A Macintosh operating OS X 10.7 or later is needed to put in RubyMotion. RubyMotion is a advertisement product and presently requires a bought license. adventure with the Ruby language and Ruby instruments like RubyGems and Rake are suggested.

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Make attractive apps with attractive code: use the based and concise Ruby programming language with RubyMotion to jot down actually local iOS apps with much less code whereas having extra enjoyable. you will research the necessities of constructing nice apps, and through the top of this ebook, you will have outfitted an absolutely useful API-driven app.

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Additional resources for RubyMotion

Example text

To catch invalid colors (like “catdogColor”), but if nothing bad happens, then we forge ahead. We grab a reference to our ColorDetailController using color_detail_controller(), set its background color, and then dismiss ourselves with dismissViewControllerAnimated:completion:(). Not bad at all, right? Take our app for a spin, and everything should go smoothly, as in Figure 4, Changing the color from a text field, on page 40. Make sure to test our exception handling in ChangeColorController, as well some less-known UIColor helpers like magenta or cyan.

Report erratum • discuss CHAPTER 3 Organizing Apps with Controllers iOS apps usually consist of more than simple rectangles and buttons. We can easily build complex interfaces using the SDK; however, we need to first learn about controllers in order to create them. Views are only one leg of the Model-View-Controller (MVC) programming paradigm adopted by the iOS SDK. A “programming paradigm” sounds intimidating, but MVC is actually fairly simple. The basic idea is that your code should have three types of objects: models to represent data, views to display those models, and controllers to process user input.

For each of these, we’ll need to push a new view controller onto our UINavigationController’s stack. UIViewControllers happens to have a navigationController() property, which lets us access the parent UINavigationController. This navigationController() is automatically set whenever we add a view controller to a navigation stack, which we did with initWithRootViewController:. pushViewController(controller, animated: true) end We call pushViewController:animated: on the navigation controller, which pushes the passed controller onto the stack.

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RubyMotion by Clay Allsopp

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